topic Re: Create 'sub basins/catchments' of a defined size in Water Resources Questions https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533840#M2770 <HTML><HEAD></HEAD><BODY><SPAN>Arc Hydro takes the Flow Accumulation (fac) and with a Stream Definition function allows you to put in the number of cells at which to start a stream. Then with Stream Segmentation and then Catchment Grid Delineation you get a catchment grid. Another function converts the grid to polygons.</SPAN></BODY></HTML> Wed, 25 May 2011 14:22:20 GMT MarkBoucher 2011-05-25T14:22:20Z Create 'sub basins/catchments' of a defined size https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533839#M2769 <HTML><HEAD></HEAD><BODY><SPAN>Hi All,</SPAN><BR /><SPAN>I'm trying to work out how to mimic output from 'global mappers watershed analysis' using ArcGIS.</SPAN><BR /><SPAN>It is straight forward to get the watercourcses and flow accumutalition grid. But i'm stumped with being able to get basins size with a defined upstream cell count/ area.... I have attached pics to demostrate.</SPAN><BR /><BR /><SPAN>Dem.png is a sample of the DEM</SPAN><BR /><SPAN>watershed_5000.png is Global mapper watershed output, with stream threshold of 5000 cells</SPAN><BR /><SPAN>watershed_500.png is Global mapper watershed output, with stream threshold of 500 cells</SPAN><BR /><SPAN>GM_function.png is shows the global mapper function window.</SPAN><BR /><BR /><SPAN>I have seen reference 'por points' but this is a manual process and i'm sure arc has a better way to do this.</SPAN><BR /><BR /><SPAN>Can anyone point me to the function within Arc that does this? </SPAN><BR /><BR /><SPAN>cheers</SPAN><BR /><SPAN>Nick</SPAN></BODY></HTML> Wed, 25 May 2011 06:43:06 GMT https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533839#M2769 nickbartzis1 2011-05-25T06:43:06Z Re: Create 'sub basins/catchments' of a defined size https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533840#M2770 <HTML><HEAD></HEAD><BODY><SPAN>Arc Hydro takes the Flow Accumulation (fac) and with a Stream Definition function allows you to put in the number of cells at which to start a stream. Then with Stream Segmentation and then Catchment Grid Delineation you get a catchment grid. Another function converts the grid to polygons.</SPAN></BODY></HTML> Wed, 25 May 2011 14:22:20 GMT https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533840#M2770 MarkBoucher 2011-05-25T14:22:20Z Re: Create 'sub basins/catchments' of a defined size https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533841#M2771 <HTML><HEAD></HEAD><BODY><SPAN>Original User: nick_gmail</SPAN><BR /><BR /><SPAN>Thanks, i have not yet tried to implement your suggestion (soo busy) but it sounds fairly straight forward.</SPAN><BR /><SPAN>Thanks again!</SPAN><BR /><SPAN>Best regards</SPAN><BR /><SPAN>Nick</SPAN></BODY></HTML> Wed, 01 Jun 2011 02:54:12 GMT https://community.esri.com/t5/water-resources-questions/create-sub-basins-catchments-of-a-defined-size/m-p/533841#M2771 Anonymous User 2011-06-01T02:54:12Z